Linux basic command execution error: the solution of command not found

This is due to a problem with the environment variable. The profile file is not written correctly, resulting in the command line ls and other commands can not be recognized.
Solution: Just type in the following section from the command line. Add the PATH of all the commands under PATH. The system can find these command script files

export PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin


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